<template>
    <div class="bg">
        <img src="../images/bg.jpg" id="bg">
    </div>
    <button style="left: 40px;top: 300px;" value="打印信息" first-focus id="i"></button>
    <button style="left: 190px;top: 300px;" value="打印警告" id="w"></button>
    <button style="left: 340px;top: 300px;" value="打印错误" id="e"></button>
</template>
